What does Descartes' rule of signs tell you about the number of positive real zeros and number

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What does Descartes' rule of signs tell you about the number of positive real zeros and number of negative real zeros of the following function?
g(x) = - x8 + 2x6 - 4x3 - 1
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College Algebra Graphs and Models

ISBN: 978-0321845405

5th edition

Authors: Marvin L. Bittinger, Judith A. Beecher, David J. Ellenbogen, Judith A. Penna

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